A measurement of the pion charge radius
نویسندگان
چکیده
منابع مشابه
Pion charge radius from charged pion electroproduction
We analyze a low-energy theorem of threshold pion electroproduction which allows one to determine the charge radius of the pion. We show that at the same order where the radius appears, pion loops induce a correction to the momentum dependence of the longitudinal dipole amplitude L01 (2) . This model-independent correction amounts to an increase of the pion charge radius squared from the electr...
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A phenomenological Dyson-Schwinger equation approach to QCD, formalised in terms of a QCD based model field theory, is used to calculate the electromagnetic charge radius of the pion. The contributions from the quark core and pion loop, as defined in this approach, are identified and compared. It is shown explicitly that the divergence of the charge radius in the chiral limit is due to the pion...
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The rainbow truncation of the quark Dyson–Schwinger equation is combined with the ladder Bethe–Salpeter equation for the dressed quark-photon vertex to study the low-momentum behavior of the pion electromagnetic form factor. With model gluon parameters previously fixed by the pion mass and decay constant, the pion charge radius rπ is found to be in excellent agreement with the data. When the of...
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We propose to perform a high precision e − p elastic cross sections measurement at very low four-momentum transfer squared, Q, from 10−4 to 10−2 (GeV/c) range using a high resolution calorimeter. The absolute value of the e−p cross sections will be controlled by a well known QED process, the Møller scattering, which will be continuously measured in this experiment within similar kinematics and ...
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The charge radii of Σ and π have been determined by direct elastic scattering on shell electrons. The measurement was performed in the framework of the Selex (E781) charm hadroproduction experiment at Fermilab which employs a 600 GeV/c high-intensity Σ/π beam and a three-stage magnetic spectrometer covering 0.1 ≤ xF ≤ 1.0. Scattering angles and momenta of both hadron and electron were measured ...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1984
ISSN: 0370-2693
DOI: 10.1016/0370-2693(84)90655-5